AirBase is the air quality information system maintained by the EEA through the European topic centre on Air and Climate Change. It contains air quality data delivered annually under 97/101/EC Council Decision establishing a reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution within the Member States (EoI Decision).

Implementation of the Montreal Protocol has led to a decrease in the atmospheric burden of ozone-depleting substances (ODSs) in the lower atmosphere and in the stratosphere. The total production and consumption of ozone depleting substances in EEA member countries has decreased strongly since the Montreal Protocol was signed in 1987, and it is practically zero nowadays. However, the ozone hole expanded in 2008 to 27 million square kilometres, equivalent to about 6 times the territory of the EU.